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Layers of rock are deposited horizontally at the bottom of a lake (principle of original horizontality).
By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.
The principle states that any geologic features that cut across strata must have formed after the rocks they cut through (Figures 2 and 3).
According to the principle of original horizontality, these strata must have been deposited horizontally and then titled vertically after they were deposited.
The layers of rock at the base of the canyon were deposited first, and are thus older than the layers of rock exposed at the top (principle of superposition).
In the Grand Canyon, the layers of strata are nearly horizontal.The age of the fossil must be determined so it can be compared to other fossil species from the same time period.